Welding 316l to Super 13 Martensitic UNS S41426 (SM13CRS)
Welding 316l to Super 13 Martensitic UNS S41426 (SM13CRS)
(OP)
Further to the very helpful response to thread330-393368: Welding 316L to 13Cr - Use 316L wire? I have now been asked to look at welding 316L to Super 13 Martensitic UNS S41426 (SM13CRS)with 110ksi yield - I am trying to understand the recommendations for this - the weld spec says 309 filler wire, is that Ok.
Secondly the recommended PWHT is heat to 1400F and cool to 360F over 3 hrs. The UNS S41426 is a Q&T martensitic steel - so I assume that we will not get anything like the 110ksi yield? What is the yield likely to be then? I don't think we can quench and temper with the 316L material welded to it can we?
Secondly the recommended PWHT is heat to 1400F and cool to 360F over 3 hrs. The UNS S41426 is a Q&T martensitic steel - so I assume that we will not get anything like the 110ksi yield? What is the yield likely to be then? I don't think we can quench and temper with the 316L material welded to it can we?





RE: Welding 316l to Super 13 Martensitic UNS S41426 (SM13CRS)
RE: Welding 316l to Super 13 Martensitic UNS S41426 (SM13CRS)
RE: Welding 316l to Super 13 Martensitic UNS S41426 (SM13CRS)
EDIT- Sorry i mean to say that the loads through the higher strength material are different than those through the lower strength material.
RE: Welding 316l to Super 13 Martensitic UNS S41426 (SM13CRS)
As a point to weldstan's comment, you better be sure the weld joint design is such that it is truly located in a low stress region or otherwise problems will develop. I can't tell how many times folks were fixated on how to weld rather than to design for DMW's in service.
RE: Welding 316l to Super 13 Martensitic UNS S41426 (SM13CRS)
RE: Welding 316l to Super 13 Martensitic UNS S41426 (SM13CRS)
So we would like
either
1) The weld process including PWHT to not affect the SM13CRS plate yield strength significantly (which I do not think is possible, hence my question)
or
2) To estimate the reduction in yield strength so that we can redesign the plate to take the required load.
RE: Welding 316l to Super 13 Martensitic UNS S41426 (SM13CRS)
If you perform a sub-critical PWHT for the SMSS after buttering it will not reduce the bulk mechanical properties. The sub-critical PWHT should be performed 50 deg F below the original tempering temperature. The purpose for the sub-critical PWHT is to reduce only the HAZ hardness in this application and residual stress.